It would also be great to have a separate reflection/refraction-texture, that could be plugged into standard 3ds max materials, or materials from other render-engines.

And for even more flexibility, please consider a reflection/refraction material, that has no surface component - only sending rays away from it. Those are great to use with blend/mix/shellac materials to make complex multi-layered shaders such as car paint, skin etc.

For the utmost in realism, bokeh should be image-mapped. In real-life, lens bokeh have different characteristics in the red, green and blue channel (chromatic aberration), something that would be cool to see a renderer support (the peregrine labs bokeh plugin for Nuke sopport this, and the results are fantastic!).